/Engine/Source/Runtime/Net/Core/Public/Net/Core/NetBitArray.h
Retrieves set bits in the provided range and returns how many indices were written to OutIndices. If OutIndices is filled to its capacity the search for set bits will end. OutIndices may be modified beyond the returned count but within the capacity.
Number of indices OutIndices was populated with.
uint32 GetSetBitIndices ( uint32 StartIndex, uint32 Count, uint32 * OutIndices, uint32 OutIndicesCapacity ) const